316 



BULLETJN 97, UNITED STATES NATIONAL MUSEUM. 



a b 



Fio. 152. — Sesauma (Holometoi'Us) han- 



.SENI, MALE HOLOTYl'E. a, ABDOMEN, X 4i ; 

 J), APPENDAGE OF FIRST SEGMENT OF ABDO- 

 MEN, VENTRAL VIEW, X 5J. 



behind, anil with a curved sulcus parallel to its posterior margin. 

 Surface smooth, punctate and without granulation. 



Superior margin of front uneven, the inner lobes slopino- back- 

 ward from the middle. Front more than four times as witle as higli : 



lower margin projecting, thin, 

 arcuate in front A-iew, slightly 

 sinuous in dorsal view. 



Hand deep, covered Avitli de- 

 pressed tubercles ; superior 

 margin "vvith a thin denticu- 

 late crest. Fingers irregu- 

 larly toothed; the largest 

 tooth of the dactylus is mid- 

 way of its length and fits be- 

 tween tlie two largest teeth of 

 the pollex. 



Legs of moderate length, 

 merus joints less than two 

 and one-half times as long as 

 wide. 



Meaauveinents. — Male holo- 

 type, length of carapace 13.5, 

 anterior width of same 16.G, posterior width of same 15.5, superior 

 width of front 9.5 mm. 

 Range. — West Indies. Only one specimen known. 



SESARMA (HOLOMETOPUS) BENEDICTI Rathbun. 



Plate 93. 



Sesarnia recta de IMax, Notes Leyden Mus., vol. 14, 1S92, p. 245). pi. 10. ligs 



4-4(7; Surinam. Not 8. recta Randall, 1840. 

 Sesarmn {Holomctoptis) benedicti Rathbun, Proc. Biol. Soe. Washington. 



vol. 11. Apr. 26. 1897, p. 90 (type-locality. Surinam; type in Leyden 



Mus.). 

 Sesarma chirayr^i Ortma.\n, Zool. .Tahrb., Syst.. vol. 10, 1897, p. 331 



(type-locality, Para; type in Mus. Phila. Acad. Sci.). — CALitAN, The 



Life of Crustacea, London, 1911, pi. 23 (facing p. 182), lower figure. 



Diagnosis. — Movable finger remarkably enlarged at base. Cara- 

 pace narrowed behind. Front very Avide. 



/>esen;^?JzV>n.— Carapace transverse, wider anteriorly than poste- 

 riorly, but not markedly so; mesogastric i-egion deeply outlined: 

 hepatic region depressed; surface rough with irregular pits and 

 Avrinkles, and on the anterior gastric region Avith small depressed 

 squamiform granules. 



Front Avide, about tAvo-thirds as Avide as carapace, and five times 

 as wide as hiuh. iuci'casiiio; in width beloAv : vertical, surface granu- 



